+

–

V+

R1

1 MΩ

DI

C1

10 nF

1.242 V

TLV3012-Q1

MSP430™

RESET

REF

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Figure 10-5. TLV3012-Q1 Configured as Power-Up Reset Circuit for the MSP430™ Microcontroller

The reset delay needed depends on the power-up characteristics of the system power supply. R1 and C1 are

selected to allow enough time for the power supply to stabilize. D1 provides rapid reset if power is lost. In this

example, the R1 × C1 time constant is 10 ms.

10.3.2 Relaxation Oscillator

The TLV3012-Q1 device can be configured as a relaxation oscillator to provide a simple and inexpensive clock

output (see Figure 10-6). The capacitor is charged at a rate of T = 0.69RC and discharges at a rate of 0.69RC.

Therefore, the period is T = 1.38RC. R1 may be a different value than R2.

V+

F = 724 Hz

V+

2/3 (V+)

1/3 (V+)

R2

1 MΩ

R1

1 MΩ

R2

1 MΩ

R2

1 MΩ

V

OUT

V

C

V+

t

C

1000 pF

T

1

T

2

t

TLV3012-Q1

Copyright © 2016, Texas Instruments Incorporated

Figure 10-6. TLV3012-Q1 Configured as Relaxation Oscillator

10.4 Power Supply Recommendations

The TLV3012-Q1 has a recommended operating voltage range (VS) of 1.8 V to 5.5 V. VS is defined as (V+) –

(V-). Therefore, the supply voltages used to create VS can be single-ended or bipolar. For example, single-ended

supply voltages of 5 V and 0 V and bipolar supply voltages of +2.5 V and –2.5 V create comparable operating

voltages for VS. However, when bipolar supply voltages are used, it is important to realize that the reference

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TLV3011-Q1, TLV3012-Q1, TLV3011B-Q1, TLV3012B-Q1

SBOS551C – MARCH 2011 – REVISED APRIL 2023

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